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A much-anticipated biography about Meghan Markle and Prince Harry pledges to reveal the truth behind a couple "not afraid to break tradition".

The pair are understood to have co-operated which has been given the title Finding Freedom - set to "reveal unknown details".

According to the promotional notes, authors Omid Scobie and Carolyn Durand will be "dispelling the many rumours and misconceptions that plague the couple" in Britain and North America, reports MirrorOnline.

Mr Scobie is the royal editor-at-large for Harper's Bazaar, while Ms Durand is a royal contributor for ELLE.com and OprahMag.com. The book is said to have been produced "with the participation of those closest to the couple".

Meghan and Harry and understood to have co-operated in the writing of the book (Image: (Image: Amazon))

The Daily Mail reports Buckingham Palace insiders believe the new publication will paint the couple in a flattering light and fear it could become a score-settling exercise.

" Finding Freedom is an honest, up-close, and disarming portrait of a confident, influential, and forward-thinking couple who are unafraid to break with tradition, determined to create a new path away from the spotlight, and dedicated to building a humanitarian legacy that will make a profound difference in the world," the description adds.

Harry, 35, and Meghan, 38, left the UK in March to start a new life away from the Royal Family in the United States with young son Archie.

The book initially had the title Thoroughly Modern Royals: The Real World of Meghan and Harry before it was revised.

The publisher of the Mail on Sunday, meanwhile, has won the first High Court skirmish in the duchess' claim against it over publication of a "private and confidential" letter to her estranged father Thomas Markle.